Commutator.



R. E. NOBLE.

GOMMUTATOR.

APPLICATION FILED AUG. 14, 1911. 1,077,914, Patented Nov.4, 1913.

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W massesz a. wry l MWL y? www Nw RALPH En NOBLE, OIE CHICAGO, ILLINOIS.

COMMUTAZTOR.

Specieationof Letters Patent Patented Nov. 4, 1913.

Original application ied July'z, 1910, Serial No.- 570,108'. Divided andthis application filed August 14, 111. SerialN0.643,834.

To 'all whomz't may 'concern Be` it .known that Il, RALPH; E. Norme, av

citizen of the United States, residing at Chicago, in the county ofCook` and:` State of Illinois, haveV invented certain new and usefulEImprovements int Commutators, of which the following isa speciiication,this application being' a division. ofz my former application', SerialNo. 570;102, filed July 2, 1910.'

ThisV invention relates more particularly' to commutators, liavingjinternal contact Surfaces for the brushes, andi to the method of'securlngjsuch commutator to the armature of the motor, althoughA somefeatures thereof maybe applicable to other types ofcommutators;

Amongtheobjects of' this invention are to provide a. simple andefficient' commutator having segments or bars which may be made veryreadilyv and: cheaply; to provide means for's'ecurely clamping, the barsor segments together so that the saine may be assembled' ifdesiredbefore being placed in position in the motor or generator; and toprovide means for securely fastening, the complete commutator inposition. I accomplish these objects and secure such other advantages asmay appear hereinafter by means of the-ape" the clamping rings; Fig. f1is a detail of one of the bars or segments; and Figs. 5 and 6 aredetails showing a modified form of bar or segment.

As shown in these drawings, 7 indicates an armature having a spider 8and a rear end plate 9 which are securely bolted together to clamp thedisks 10 in position. The armature is provided with windings 11,preferably of the barrel type, within the end turns of which ispreferably located the commutator 12. rllhe commutator bars or segments13, as indicated in Figs. 1 to 4, are made of stock of uniform crosssection, the sides of the bars converging so that, when the insulatingstrips 14 are placed between the same, they will iit together to meansof rivets 16 as clearly indicated in= ig. 4t; These radials preferablyextend out yfrom the outer ends of tlie'barsandl the leads from thearmature coils are usually soldered thereto. The annular ring, formedyby the commutator bars or segments and the intermediate insulatingstrips; is insulated from `the adJacent parts by means of an insulatingband 16 andV anl insulating: disk-17 which embrace the outer sides andVinner ends of the bars. Around the band 16A is passed a clamping ring:`18 which is beveled around the outer end, andis split diagonally asindicated at 139 so that, when thisring is pressed inwardly, the endsofl the segments thereof may slide upon each other sufficiently toyallow the rings to be pressed against the band 16.

The inner edges of the' segments. of` the ring 18 are rounded or cutaway adjacent- "to'theslits 19 as indicated at 2O so. that theinsulatingmaterial ofl the ring orband: 16

lmay be slightly pressed therein when the .ring is tightened. A secondclamping ring 21 1s beveled on its inner surface to engage with theouter beveled surface of the ring 18 and its inner end fits within aflange 22 on a supporting ring or plate 23. The inner side of the ring18 rests against this plate. Bolts 24 extend out through the plate 23with their threaded ends engaging with tapped holes in the ring 21 sothat when these bolts are tightened the ring` 21 will be drawn inwardly,thereby pressing against the segments of the ring 18 which will securelyclamp the insulating band 16 and commutator parts 13 and 14: together toform a substantial commutator. The holding plate or ring 23 is providedwith inwardly extending lugs or projections 25 which bear against theend of the spider 8, portions of the spider being preferably cut away toreceive these lugs as indicated 1n Figs. 1 and 2. The plate 23 is heldin position by means of bolts 26 which extend through the spider andrear end plate 9 and have their threaded ends engaging with tapped holesin the lugs 25. The commutator and its clamping and supporting rings areinsulated from the armature windings by means of insulating material 27placed between them. The brush or brushes indicated at 28 may be made inany desired manner, these brushes making internal contact with thecommutator as shown in Figs. 1 and 2.

The construction and operation of my improved commutator will be readilyunderstood, by those familiar with the art, from the above descption andthe accompanying drawings.

It is particularly noted that, by means of my improved construction, thecommutator may be made very readily and cheaply and is of substantialconstruction, the arrangement being such that the commutator may becompleted and may then be readily secured to the armature by means ofthe bolts 26 which hold it securely in position.

Instead of the form of bars and radials heretofore described, I may insome instances use the form shown in Figs. 5 and 6. As shown in thesefigures, the bar 29 is made integrally with the radial 80, these bybeing forged out of suitable material. Nhile this construction does notpermit of the bars or segments being made from strips of stockmateriahyet the combined segments and radials may be rapidly andeconomically formed by means of suitable dies.

Having thus described my invention, which, however, I do not wish tolimit to the exact details of construction or arrangement of partsherein `shown and described, except as set forth in the followingclaims,

what I claim and desire to secure by Letwardly, and an annular ringformed of contact members and intermediate insulating members, adaptedto be engaged by said collapsible ring and the parts held in positionthereby, said last-named annular ring being insulated from the otherring.

2. The combination with a rotatable device comprising circularlyarranged component parts, of a plurality of segmental piecesconstituting a ring for encircling the device and having their lines ofabutment inclined to the plane of the ring, and mechanical means forexerting a uniform inward pressure upon the said ring.

3. The combination with a rotatable device comprising circularlyarranged component parts, of a plurality of tapered segmental piecesconstituting a ring with a cylindrical inner surface and a conical outersurface, the lines of abutment of the mental pieces being inclined tothe plane of the ring, a collar surrounding the ring and having acorresponding conical inner surface, and means for causing axialmovement of the collar upon the said ring.

' RALPH E. NOBLE. lVitnesses:

M. W. MURTZ.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

